4. Ko'phadlarning yig'indinisini toping. 1) 0,2x² - 0,4y² va - 0,3x² +0,5y² 3) 5a²b - ab² va - 3a²b+ 4ab² 5)2 1/3 a² - 4/5 b² va 6 2/3 a² +7 2/5 b²

Ko'phadlarning yig'indisini topish uchun ularni qo'shish kerak. 1) $$0.2x^2 - 0.4y^2 + (-0.3x^2 + 0.5y^2) = (0.2-0.3)x^2 + (-0.4+0.5)y^2 = -0.1x^2 + 0.1y^2$$ Javob: $$-0.1x^2 + 0.1y^2$$ 3) $$5a^2b - ab^2 + (-3a^2b + 4ab^2) = (5-3)a^2b + (-1+4)ab^2 = 2a^2b + 3ab^2$$ Javob: $$2a^2b + 3ab^2$$ 5) $$2\frac{1}{3}a^2 - \frac{4}{5}b^2 + 6\frac{2}{3}a^2 + 7\frac{2}{5}b^2 = (2\frac{1}{3} + 6\frac{2}{3})a^2 + (7\frac{2}{5} - \frac{4}{5})b^2$$ $$= (2 + \frac{1}{3} + 6 + \frac{2}{3})a^2 + (7 + \frac{2}{5} - \frac{4}{5})b^2 = (8 + \frac{3}{3})a^2 + (7 - \frac{2}{5})b^2$$ $$= 9a^2 + (7 - 0.4)b^2 = 9a^2 + 6.6b^2$$ Javob: $$9a^2 + 6.6b^2$$